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<h1 class="page">jMonkeyEngine SDK: Version Control</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Whether you work in a development team or alone: File versioning is a handy method to keep your code consistent, compare files line-by-line, and even roll back unwanted changes. This documentation shows you how to make the most of the SDK&#8217;s integrated version control features for Subversion, Mercurial, and Git.</p>
</div>
<div class="paragraph">
<p>For every team member, the file versioning workflow is as follows:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Once: Download a working copy of the project from the repository (&#8220;checkout&#8221;).</p>
</li>
<li>
<p>Regularly: Upload your own changes to the repository (&#8220;commit&#8221;).</p>
</li>
<li>
<p>Regularly: Download updates by others from the repository (&#8220;update&#8221;).</p>
</li>
</ol>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>Since the jMonkeyEngine SDK is based on the NetBeans IDE and the NetBeans Platform, you can learn about certain jMonkeyEngine SDK features by reading the corresponding NetBeans IDE tutorials (in the &#8220;see also&#8221; links).</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="version-control-systems"><a class="anchor" href="#version-control-systems"></a>Version Control Systems</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The jMonkeyEngine SDK supports various Version Control Systems such as Subversion, Mercurial, and Git. No matter which of them you use, they all share a common user interface.</p>
</div>
<div class="paragraph">
<p>You can use file versioning alone or in a team. The advantages are that you can keep track of changes (who did it, when, and why), you can compare versions line-by-line, you can revert changes to files and lines, merge multiple changes to one file, and you can even undelete files.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="creating-a-repository-upload"><a class="anchor" href="#creating-a-repository-upload"></a>Creating a Repository (Upload)</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Requirements:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>You must have a project that you want to version.</p>
</li>
<li>
<p>You must have version control software installed (Subversion, Mercurial, or Git) and have initialized a repository.</p>
<div class="ulist">
<ul>
<li>
<p>Tip: For Subversion, for example, the init command looks like this example: <code>svnadmin create /home/joe/jMonkeyProjects/MyGame</code></p>
</li>
</ul>
</div>
</li>
<li>
<p>The computer where the repository is to be hosted must be available in your team&#8217;s network, or you will only be able to use your repo locally.</p>
<div class="ulist">
<ul>
<li>
<p>Tip: Hosts such as SourceForge, GoogleCode, dev.java.net offer free version control services for open-source projects.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
<div class="paragraph">
<p>Now you create a repository to store your project&#8217;s files.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>In the jMonkeyEngine SDK, <b class="button">RMB</b> click the project in the &#8220;Projects&#8221; window and choose <span class="menuseq"><b class="menu">Versioning</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Import Into Subversion Repository</b></span> (or initialize Mercurial Project, etc, respectively).</p>
<div class="ulist">
<ul>
<li>
<p>Tip: If you haven&#8217;t evaluated yet which system to choose, start with Subversion for now.</p>
</li>
</ul>
</div>
</li>
<li>
<p>Go through the wizard and fill in the fields to set up the repository.</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="checking-out-a-repository-download"><a class="anchor" href="#checking-out-a-repository-download"></a>Checking Out a Repository (Download)</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You and your team mates check out (download) the repository to their individual workstations.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Go to the &#8220;Team&#8221; menu and choose <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Checkout</b></span> (or Git or Mercurial respectively)</p>
</li>
<li>
<p>Fill in your repo data into the wizard and click Finish.</p>
<div class="ulist">
<ul>
<li>
<p>If you want to be able to submit changes, you must have a username and password to this repository. Otherwise leave these fields blank.</p>
</li>
</ul>
</div>
</li>
<li>
<p>The repository is downloaded and stored in the location you chose.</p>
</li>
<li>
<p>Use the <span class="menuseq"><b class="menu">File</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Open Project</b></span> menu to open the checkout as project and start working.</p>
<div class="ulist">
<ul>
<li>
<p>If the checkout is not recognized you need to choose <span class="menuseq"><b class="menu">File</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">New Project from Existing Sources</b></span></p>
</li>
</ul>
</div>
</li>
</ol>
</div>
<div class="paragraph">
<p>Of course you can also check out existing repositories and access code from other open-source projects (e.g. SourceForge, GoogleCode, dev.java.net).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="updating-and-committing-changes-send-and-receive"><a class="anchor" href="#updating-and-committing-changes-send-and-receive"></a>Updating and Committing Changes (Send and Receive)</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Receiving the latest changes from the team&#8217;s repository is referred to as <code>updating</code>. Sending your changes to the team&#8217;s repository is referred to as <code>committing</code>.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Before making changes, <b class="button">RMB</b> click the project and select <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Update</b></span> to make sure you have the latest revision.</p>
<div class="ulist">
<ul>
<li>
<p>Get in the habit of updating regularly, always before you edit a version controlled file. It will spare you much grief.</p>
</li>
</ul>
</div>
</li>
<li>
<p>After making changes to the project, make certain your change did not break anything.</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>Update, build, run, test.</p>
</li>
<li>
<p>Look at the red/green/blue marks in the editor to review what you have deleted/added/changed. Click the marks to review all differences in a file.</p>
</li>
<li>
<p>Choose <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Show Changes</b></span> to see all files that were recently changed – by you and other team members.</p>
</li>
<li>
<p><em>Update again</em> in case your team mates made changes while you were reviewing.</p>
</li>
</ol>
</div>
</li>
<li>
<p>If there are no conflicts and you want to commit your changes, choose <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Commit</b></span> from the menu.</p>
</li>
<li>
<p>Write a commit message describing what you changed.</p>
<div class="ulist">
<ul>
<li>
<p>Remember, you are writing a message to your future self. Never write redundant stuff like &#8220;I changed something&#8221;.</p>
</li>
</ul>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="comparing-and-reverting-changes"><a class="anchor" href="#comparing-and-reverting-changes"></a>Comparing and Reverting Changes</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>If you and another committer edited the same line, there is a conflict, and the jMonkeyEngine SDK will show an error message.</p>
<div class="ulist">
<ul>
<li>
<p><b class="button">RMB</b> click a file Choose <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Resolve Conflict</b></span></p>
<div class="olist lowerroman">
<ol class="lowerroman" type="i">
<li>
<p>Compare the conflicting versions. Press the buttons to accept or reject each change individually.</p>
</li>
<li>
<p>After the resolver shows green, save the resolution.</p>
</li>
<li>
<p>Build and test the resolution, update, and commit.</p>
</li>
</ol>
</div>
</li>
</ul>
</div>
</li>
<li>
<p><b class="button">RMB</b> click a file and choose <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Search History</b></span>.</p>
<div class="ulist">
<ul>
<li>
<p>You can inspect a file&#8217;s history and see who changed what, why, and when.</p>
</li>
<li>
<p>You can roll back a file to a historic version if necessary.</p>
</li>
</ul>
</div>
</li>
<li>
<p>In general, you can choose <span class="menuseq"><b class="menu">Subversion</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Diff</b></span> for any file to see two versions of a file next to each other.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="no-version-control-local-history"><a class="anchor" href="#no-version-control-local-history"></a>No Version Control? Local History!</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If you do not use any version control, you can still track changes in projects to a certain degree.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><b class="button">RMB</b> click a file or directory and choose Local History to show or revert changes, or undelete files.</p>
</li>
<li>
<p>You can also select any two files in the Project window and choose <span class="menuseq"><b class="menu">Tools</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Diff</b></span> to compare them.</p>
</li>
<li>
<p>Local History only works for files edited in jMonkeyEngine SDK Projects (It does not work for other files, e.g. in the Favorites window.)</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>See also:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="http://netbeans.org/kb/docs/ide/subversion.html">Source Code Management with Subversion</a></p>
</li>
</ul>
</div>
</div>
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